IT-SecurityΒΆ
Hackthebox and TryHackMe are great places to learn about security. You can create an account and then hack into several machines to learn about security.
In order to start a good resource is OWASP Top ten which regularly lists the ten most prominent vulnerabilities in web. Each vulnerability comes with an explanation.
Furthermore, linux distributions like Kali Linux or Parrot OS comes with plenty of tools which come in handy when learning and exerting security.